Boy Assad obviously didn't agree to a deadline just out of his soul's goodness: it would involve some trade-off. The Economist doesn't tell us what he was offered in return. Why?
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It seems that he doesn't act as promised because the opposite side didn't deliver their side of the deal.

If the international community is going to support the process of a regime change then it has to make sure that the next administration is better than the current one. That means kurds need to be listened to like every other citizen of Syria. It is the responsibility of the international community. And if Turkey is up to it's dirty tricks again then maybe these meetings should take place in another country. It seems that turkey doesn't know how to solve problems but to create them.
Am i wrong to blame turkey for this as some says it is Turkey that put pressure on SNC to refuse kurdish demands. Is the world going to ignore the kurds yet again?

Yes, the Syrians are terrible. Damn those Syrian Army troops who have no right to operate within their own national boundaries and use tanks, aircraft and artillery in civilian residential areas. It is deplorable behavior. Why can't the Syrian Government just lay down their weapons and let the "good guys" take control of the country?
By comparison it was totally OK for the United States Military to occupy Iraq and use heavy weapons on the civilian population. Just as it was totally OK for Israel to use heavy weapons against civilians in Lebanon in 2006 and against Palestinian civilians in Gaza in 2009. That is OK because Israel and the United States are the "good guys". Exceptional countries who do not have to be held to the same standards as anyone else.

The SNC doesn't seem to be much better than the Assad regime. It has turned down Kurdish demands. If they are going to behave exactly like the old regime, why change of regime? Let's keep Asad and work with him instead.

Seriously why replace a tyrant with another? I say let's stick with Asad. Christians are worried about what might happen if regime changes, the alawitas are worried about people might want to take revenge and now they are already treating the kurds like non-citizens. I think we should stick with Asad. After all as they say it is better the devil you know